Hermetically sealed operating device



May 1953 R. D. NELSON 2,551,847

HERMETICALLY SEALED OPERATING DEVICE Filed April 5, 1947 INVENTOR.Ala/7427 4 5. /Ve/5a22 Patented May 8, 1 951 FATENT FWE HERMETICALLYSEALED OPERATING DEVICE Delaware Application April 5, 1947, Serial No.739,597

1 Claim. 1

This invention relates to an hermetically sealed operating device.

Herrnetically sealed transformers are comlng into more common use in theelectrical industry and it is desirable to have metal to metal seals atall entrances to the transformer tank. Vari ous seals for non-movingparts, such as bushing seals have been developed, and the covers of thetanks have been welded in place to provide an hermetically sealedtransformer.

Objects of this invention are to provide a metal to metal seal for anoperating device having a movable ernal operating part located on theoutside of the tank and a movable internal located on the inside of thetank or container and arranged to be operated by the externally locatedoperating member and still maintain the hermetic metal to metal seal forthe tank or contamer. .A oecific instance of the use of such a device isfor tap changing for an hermetically sealed transformer though thedevice is capable of other uses such as resetting or tripping oroperating hermetically sealed switches or other h rmetically sealedapparatus.

An embodiment of the invention is shown in the accompanying drawings, inwhich:

Figure l is a plan view of the device.

Figure 2 is a vertical sectional view.

Referring to the drawing, it will be seen that a transformer tank orhousing has been indicatcd by the reference character i and a flangemember by the reference character 2. The flange 2 is brazed, welded, orotherwise secured to the tank and is provided with an internallythreaded aperture into which a bearing bushing 3 is screwed. Thisbushing constitutes a bearing for the shaft 3 which is the operatingshaft for a tap changer, a switch or other device shown in block formand indicated by the reference character 5. This device whether it be atap changer, a switch of some other type, or any other form of mechanismis the internally located member in an hermetically sealed casing orcontainer such as the transformer tank E.

An external operating member, such as the handle 5 is provided foroperating the internally located member. The shaft 3 is provided with alaterally bent or offset portion 3' which is provided with a recess 8 atits upper end. A pin 9 is located within the recess 8 and the shaft 5-,l is free to rotate without rotating the pin ii. The pin 9 is preferablyintegral with a metal disk i0 which has an outwardly projecting pin II.

A flexible metal bellows i2 is soldered or otherwise secured in anair-tight manner to the disk l9 and flange 2 at its upper and lowerends, respectively. T is bellows does not rotate but tilts from oneposition to another as the shaft :3, l is rotated.

Means, in the form of a slotted disk or crank member I3 is provided witha radial slot M which loosely receives the pin it and which moves thepin around when the disk is rotated thus causing rotation of the shaft4, l without rotating either the disk it or the bellows l2. If desired,a part of the lower face of the disk is may be slanting as indicated atE5 and located immediately above the disk 50. This will act to limitoutward motion of the disk iii. A shaft is is formed integral with thedisk I3 and is secured as by means of a pin l? or in any other way tothe external operating member 6.

A casing or housing 58 is attached to the flange 2 of the tank andprotects the bellows E? from the weather and also furnishes a bearingfor the shaft it. If desired, a graduated plate l9 may be secured to thetop of the housing I8 to indicate in conjunction with the operatingmember 6, the particular tap or position of the internal member.

It will be noted that the member consisting of the disk ill with itsprojecting pins 9 and H constitutes a coupling member between theexternal operating means and the shaft 4, l, and is pivotally orrevolubly joined to the shaft l, 7.

It will be seen that a novel form of metal to metal hermetic seal hasbeen provided whereby an internal member or mechanism located in anhermetically sealed container can be operated by an externally locatedoperating member.

Although this invention has been described in considerable detail, it isto be understood that such description is intended as illustrativerather than limiting, as the invention may be variously embodied and isto be interpreted as claimed.

I claim:

An hermetically sealed operating device comprising a container, aninternally located device, a shaft for operating said internally locateddevice, said shaft projecting through said contoiner and having alaterally deflected outer end at an angle to the axis of said shaft, acoupling member consisting of a disk having an outwardly projecting pinand an inwardly projecting pin, said inwardly projecting pin beingpivotally connected with the laterally deflected outer end of saidshaft, a flexible metal bellows hermetically sealed to said disk and tosaid container and surrounding the laterally deflected end of saidshaft, a rotary external member operatively coupled to said outwardlyprojecting pin, and a housing supported from said container andenclosing said bellows and furnishing a support for said rotary externalmember, said rotary member having a slanting inner face arranged tocoact with said disk to limit outward motion of said bellows.

ROLLAND D, NELSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

Number Number 4 UNITED STATES PATENTS Name Date Holmes Nov. 21, 1922FOREIGN PATENTS Country Date Switzerland 1942 Great Britain 1919 GreatBritain 1943

